18229136 has 10 divisors (see below), whose sum is σ = 35318982. Its totient is φ = 9114560.

The previous prime is 18229129. The next prime is 18229157. The reversal of 18229136 is 63192281.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 115600 = 4256^2 + 340^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569645 + ... + 569676.

Almost surely, 2^18229136 is an apocalyptic number.

18229136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18229136 is a deficient number, since it is larger than the sum of its proper divisors (17089846).

18229136 is a wasteful number, since it uses less digits than its factorization.

18229136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139329 (or 1139323 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 18229136 is about 4269.5592278361. The cubic root of 18229136 is about 263.1815023200.

The spelling of 18229136 in words is "eighteen million, two hundred twenty-nine thousand, one hundred thirty-six".